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2. Educational stage - Wikipedia

   en.wikipedia.org/wiki/Educational_stage

   Primero de infantil (Preschool 1) Optional 2–3, or 3–4 Primary: Segundo de infantil (Preschool 2) Optional 3–4, or 4–5 Tercero de infantil (Preschool 3) Optional 4–5, or 5–6 Primary One Compulsory 5–6, or 6–7 Primary Two Compulsory 6–7, or 7–8 Primary Three Compulsory 7–8, or 8–9 Primary Four Compulsory 8–9, or 9–10

3. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   The oldest known multiplication tables were used by the Babylonians about 4000 years ago. [2] However, they used a base of 60. [2] The oldest known tables using a base of 10 are the Chinese decimal multiplication table on bamboo strips dating to about 305 BC, during China's Warring States period. [2] "Table of Pythagoras" on Napier's bones [3]

4. Vedic square - Wikipedia

   en.wikipedia.org/wiki/Vedic_square

   Vedic square. In Indian mathematics, a Vedic square is a variation on a typical 9 × 9 multiplication table where the entry in each cell is the digital root of the product of the column and row headings i.e. the remainder when the product of the row and column headings is divided by 9 (with remainder 0 represented by 9).

5. Multiplication - Wikipedia

   en.wikipedia.org/wiki/Multiplication

   Multiplication can also be thought of as scaling. Here, 2 is being multiplied by 3 using scaling, giving 6 as a result. Animation for the multiplication 2 × 3 = 6 4 × 5 = 20. The large rectangle is made up of 20 squares, each 1 unit by 1 unit. Area of a cloth 4.5m × 2.5m = 11.25m 2; 4 ⁠ 1 / 2 ⁠ × 2 ⁠ 1 / 2 ⁠ = 11 ⁠ 1 / 4 ⁠

6. 78 Moms Spill The Parenting Hacks That Keep Their Homes ... - AOL

   www.aol.com/78-moms-spill-parenting-hacks...

   Image credits: ConcentrateOk6837 #8. When my toddlers/little kids get hurt I ask them "did it hurt you or scare you" and at least half the time they think about it and decide it just scared them ...

7. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   Trachtenberg system. The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Russian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration camp.